Could you please specify when did you start experiencing this issue? Did you do anything in-game after which you started seeing that? Please try to provide as much information that you consider relevant as you can, so we can look into this.

Yes, I have seen this before, I happen to notice this kind of bug every time I leveled up my Premium Level.
So, what's your current Premium Level (if I may ask)?, just wanna check if there's a possible correlation.